Safety device for plunger presses



Apr-H 29, 1924. 1,492,224

M. A. SCHULZE SAFETY DEVICE FOR PLUNGER PRESSES Filed May 25. 1923 2 Sheets-Sheet 1 fl wmvsssaa. INVENTOR.

@M Z W/ BY W DA .W 7%)?4/4 1 ATTORNEY 1,492,224 M.A.SCHULZE SAFETY DEVICE FOR PLUNGER PRESSES 2 sheets-sheet 2 Filed May 25 1923 HVVENTUR.

Patented Apr. 2%,

U N l T ST F traaaza err-"ice.

MAX A. seminar, on risevrnsnen, ar-Ionn ISLAND, essrenora TO rats n. m. it. com PANY, or PAWTUGKET, nrrenn rsnaun. A oofaronarlon or scorn nexo'ra.

SAFETY DEVICE FOR PLUNGER PRES SES.

Application med May 25,

T 0 (6 whom it may concern.

Be it known that 1, MAX A. SGHULZE, a citizen of the United States, residing at 39% Redwing Street, Providence, in the county of Providence and State of Rhode Island, have invented certain new and useful Improvements in Safety Devices for Plunger Presses, of which the following is a specification.

My invention relates to improvements in safety devices for plunger presses, its pur pose being to protect the hands of operators working on plunger presses. It consists substantially of a rack work fixed to the plunger, a pinion mounted on a horizontal shaft and driven by said rack, a vertical shaft operated by said horizontal shaft through the medium of bevelled gears and a horizontally reciprocating member actuated by said vertical shaft through the medium of a second rack and pinion, said reciprocating member sweeping backward and forward over the bedof the press by the movement of the plunger.

As a modification of my invention, I also describe in this application, and illustrate in the drawings, a form of my device by which the protecting member instead of sweeping backward and forward reciprocally will rotate back and forth through approximately a quarter circle, both methods, however, accomplishing the same purpose of removing the hands of the operator from beneath the plunger as the latter descends.

The same parts are designated by the same figures throughout the several views.

My invention is fully shown by the accompanying drawings, in which Figures 3, 4iand 5 show my invention while Figures 1 and 2 show an alternate form of the same.

Figure 1 is a vertical view of the plunger of the press with the protecting member and the various parts of the mechanism operating the same.

Figure 2 is a horizontal view of the same through the line A-A of Figure 1.

Figure 3 is a vertical view of that modification of my device employing a reciprocal member passing back and forth over the bed of the plunger.

Figure 4 is a horizontal view of the same through the line BB of Figure 3.

Figure 5 is a cross-section of the rack carrying the reciprocating member aforesaid.

In Figure 1, the numeral 2 is a vertical 1523. Serial No. 641,523.

plate bolted or otherwise securely fixed upon the framework of the press in the rear of the plunger while 1 represents the plunger itself. die-presents a rackwork fixed upon the rear of the plunger and operating the pinion 1.6- which is fixed upon the horizontal shaft 7 supported by the bearing 9, said shaft 7 having fixed upon it the bevel gear 10; the shaft 7 is supported at the outer end by the bearing 14. The bevel gear 10 drives the corresponding bevel gear 11 which is fixed upon the vertical shaft 13 supported by the bearing 12. Upon 13 is fixed the member 15 which passes horizontally backward and forward over the bed of the plunger through approximately a quarter circle, aswill be hereafter described. 3 in Figure 1 is the bed of the press, and 4 the framework of the press supporting said bed.

5 represents the lower end of the plunger while 6 is a belt for holding the bed 3 in position on the framework or table 4: of the press.

The operation of this form of my invention will be clearly seen by an inspection of Figures 1 and 2. As the plunger of the press moves up and down, the rackwork 8 actuates the shaft 7, and through the me dium of the bevel gears 10 and 11 causes the vertical shaft 13 to rotate and the respective relations and adjustment of the various parts are such that the rotation of 13 is approximately through a quarter circle. The guard member 15 being fixed upon the verti cal shaft 13 is so adjusted with reference to the bed 3 that when the plunger 1 is at the top of is movement the free end of the member 15 is at the rear of the bed 3, and as the plunger 1 descends, the member 15 moves across the bed 3 through approximately a quarter circle so that when the plunger is at its lowest point the member 15 will be projecting directly toward the front of the press. As the plunger goes up, the member 15 retraces its course back across the bed 3.

It will be seen that if the hand of the operator should be under the descending plunger, the member 15 would sweep the hand of the operator away from the descending plunger 5.

What I deem the better form of my device, including substantially the same features, is shown in Figures 3 and 4. In these figures, the moving parts are identical with the modification shown in Figures 1 and 2,

with the exception of the member 15 and its immediate connecting parts.

In other words, the same rack and pinion 8-16, the same horizontal and vertical shafts 713 connected by the bevelled gears 10-11, are employed, but on the vertical shaft 13 is fixed a pinion gear 17 V Figure '1 which is a horizontal section on the plane BB of Figure 3 shows the respective parts clearly.

18 in this figure is a rack and at the extremity of this rack 18, nearest the operator, is an arm 15 fixed to the rack 18 by the bolt 19. Figure 5 is a vertical section through the rack 18 showing the fitting of the same in the plate 2, 21 being the enclosing wall or casing formed by the plate 2, and 20 representing the rack teeth; 23 being a key in the plate 2 fitting a corresponding depression in 18 to preserve proper alignment thereof. As the rack 18 reciprocates by the alternate forward and backward revolution of the pinion 17, through the operation of the ascending and descending plunger, it carries forward and back ward across the bed of the press the arm 15, the movement being so adjusted that 15 sweeps across the bed 3 of the press before the plunger descends thus removing the hand of the operator and preventing its being caught by the descending plunger.

Having now described my invention, What I claim and desire to secure by Letters Pat.- ent is- The combination in a plunger press of a rack fixed upon the plunger; a horizontal shaft and a pinion thereon operated by said rack; a vertical shaft and a pinion fixed thereon; bevelled gears one upon each of said shafts in mesh with each other; a vertical plate fixed upon the frame of the press and having a perforation therein; a rack sliding back and forth in said perforation and operated by the pinion on said vertical shaft; and a guard member fixed upon the outer end of said rack and adapted to move forward and backward across the bed of the press by the rise and fall of the plunger through the instrumentalities aforesaid, substantially as described.

In testimony whereof I afiix my signature in presence of two witnesses.

MAX A. SCHULZE.

Witnesses:

EDITH M. BRoMLnY, MARJORIE F. BROWN. 

